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WAC: World Aeronautical Chart, a chart using a scale of 1:1,000,000 used for VFR flight (similar to a sectional chart)

WAKE TURBULENCE: The contra-rotating downward-moving vortices generated by the wingtips of an aircraft in flight.

WASTE GATE: The variable-volume opening at the rear of a P-51's belly-mounted radiator airscoop.

WATER INJECTION: A technique for cooling an engine under high power so that higher than normal power settings may be used. See WEP below.

WAYPOINT: A geographical position used for route/instrument approach definition or progress reporting

WARNING AREAS: A type of airspace over international or coastal waters that may contain hazards to nonparticpating aircraft.

WCA: Wind Correction Angle is the difference between the aircraft heading and the desired course and shows how much adjustment is needed to maintain that course.

WEIGHT AND BALANCE: The existing configuration of aircraft gross weight and center of gravity position at time of takeoff. For safe flight this pair of parameters must exist within the parameter "envelope" defined by the aircraft manufacturer.

WEP: War Emergency Power, an engine power output limit that may be exceeded only for short periods of time lest the engine overheat and seize.

WHEELS LANDING: To "drive" an aircraft onto a runway without a flare maneuver but at a safe low descent rate that will not overstress the landing gear.

WHISKEY COMPASS: A magnetic compass instrument the visible portion of which floats in a bath of alcohol.

WING DOWN: An approach descent maneuver in which the aircraft is yawed in one direction with its wings set to turn in the other direction, resulting in straight ahead flight with high drag.

WINGLETS: Wingtip-mounted vertical "fences" that act to halt the spanwise flow of air over the wing, thereby increasing apparent wingspan, which in turn increases lift.

WING LEVELER: An electronic device for preventing unintended turns from developing while the pilot's attention is diverted away from the real or artificial horizon.

WRECK CHASER: An amateur crash site archaeologist.

WX: Teletype jargon for "weather".


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